The phrase "to become unbalanced" means to lose one's balance or equilibrium, often metaphorically referring to a person losing emotional stability or mental well-being. Full definition
This causes us to seek out more carbohydrates and suddenly our diet becomes unbalanced as we become «carb - driven.» (flippingfifty.com)
Some will see results right away and the acne may not come back until menopause (when hormones become unbalanced) for women. (clearskinbynature.com)
Clomicalm (clomipramine) is a tricyclic antidepressant that affects chemicals in the brain (serotonin) that may become unbalanced leading to behavioral problems in dogs. (1800petmeds.com)